Safety-fuse.



PATENTED AUG. 25, 1903.

J. SACHS.

SAFETY FUSE.

APPLICATION FILED SEPT. 29. 1902.

N0 HODEL.`

UNITED STATES Patented August 25, 1903.

PATENT OFFICE.

JOSEPH SACHS, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE JOHNS- PRATTCOMPANY, OF HARTFORD, CONNECTICUT,'A CORPORATION OF CONNECTICUT.

SAFETY-FUSE.

SPECIFICATION forming part of Letters ratentNo. 737,284, dated August25, 1903.

Application filed September 29, 1902. Serial No. 125,170. (No model.)

ToaZZ whom, t may concern,.-

Be it known that I, JOSEPH SACHS, a citizen of the United States,residing at Hartford, in the county of Hartford and State ofConnecticut, have invented an Improvement in Safety-Fuses, of which thefollowing is a specification.

My invention relates to safety-fuses, and particularly to that type ofsafety-fuses which is adapted for use on high-tension circuits.

In fuses adapted for use on high-tension circuits it has been necessaryto make the fuse-strips abnormally long in order to pre-n vent severearcing between the terminals when a fuse is blown. Consequently thespace occu pied by this class of fuses heretofore has beeninconveniently long; and the object of my present invention is toproduce a high-tension-circuit fuse having a fusestrip of requisitelength and resultant capacity to give suflicient arcing distance whenthe fuse is blown, and which fuse at the same time shall occupy no morespace than a fuse of lower-voltage capacity.

Modifications of my invention also make it applicable to fuses ofheavy-current capacity as well as high voltage.

In carrying out my invention I provide a casing or support which isdivided longitudinally or transversely into any desired number ofsections or compartments within and through each of which a fuse-stripextends. I also provide terminals for the casing or support andelectrical connections between the same and one end of the respectivefuse-strips in two of the said compartments and electrical connectionsbetween the alternate ends of the fuse-strips in adjacent compartmentsor electrical connections from` the said terminals to the respectiveends of the fuse-strips. The said compartments may or may not be filledwith a loose insulating and heat-dissipating material, and the walls bywhich the casing is divided into said compartments are preferably madeof an insulating material--` as, for instance, asbestos paper- Which mayor may not be either perforated or porous,` so that upon the blowing ofa fuse the heat and gases generated thereby are uniformly diffused andabsorbed entirely within the casing. The filling may be of a nature tocombine with the fuse metal under the heataction of the current orotherwise.

y In the drawings, Figure 1 represents a central longitudinal section ofa safety-fuse constructed according to my present invention. Fig. 2 is across-section at 0o Qc, Fig. l. Figs. 3, 5, and 7 are respectivelysimilar views of modifications of the form shown in Fig. l, Fig. 4tbeing a cross-section at w rc, Fig. 3. Fig. 6 is a cross-section at y y,Fig. 5. Fig. 8 is a cross-section at y y', Fig. 7, and Fig. 9 is across-section at z e', Fig. 7. Fig. 10 is a transverse section of amodification of the form shown in Figs. 7, 8, and 9.

a represents a fuse casing or support, made of any good insulatingmaterial and preferably cylindrical in shape.

b b represent the terminals for the fusecasing a., which are secured tothe ends thereof in any desired manner. I have shown the terminals b ofcap shape; but I do not limit myself to this form, as they may be o fany well-known type. In Fig. l I have shown the casing divided 'intolongitudinal compartments 2 by the radial division-walls 3, said wallspreferably extending between the plugs a within the casing and adjacentto the inner surfaces of the terminals b.

c represents a strip of fusible metal, one

end of which is secured electrically to one of i the terminals b at 4and is then'carried along one compartment through the wall and sosuccessively through all the compartments 2, being threaded from one tothe next adjacent compartment at the alternate ends thereof andterminating at the other end in an electrical connection with theopposite terminal b at 5. Y

In Figs. 3 and 4, which are modifications of Figs. l and 2, I have showntransverse division-walls 6 adjacent to the terminals b and whichpartake of the nature of plugs for the casing a. Between the transverseWalls 6 the casing a is divided into independent cornpartments 7 by thelongitudinal walls 8 in series at right anglesto one another. Thefusestrip c extends through each of the said independent compartments 7in succession and is connected electrically at its respective ends 9 and1Q to the terminals b.

In Figs. 5 and 6 I have illustrated the cas- IOO ing ct as divided intocylindrical compartments 11 by the transverse division-walls 12, whichmay be made to wedge within the casing ct or may be held in position, asshown, by means of the hollow cylindrical sections 13, fitting closelywithin the casing a. Here the fuse-strip c is also secured electricallyat its respective ends 14 15 to the terminals b b and passedsuccessively through each compartment 11, being threaded from one to thenext adjacent compartment, preferably at diametrically opposite sidesthereof.

In Figs. 7, 8, and 9 I have illustrated a modification consisting in theusual casing or support d and the terminals b b, which in this form arepreferably adapted to screw onto the ends of the casing d. Within thecasing I employa plurality of inclosed fuses, each having itsindependent casing d, terminals e, and fuse-strip h. These independentinclosed fuses are secured within the casing a in any desired manner. ihave shown as a suitable support a split transverse frame t', fittingwithin the casing and through which the independent fuses pass and aresecured. Any other devices, however, by means of which the fuses may beeasily removed from the casing may be used with equal facility andutility. I have shown the various independent fuses connected in seriesbetween the terminals b by means of the leads 16 and 17 and connectionsZ,- but it Will be apparent that the fuses may be connected in multiplebetween the terminals should it be desired to obtain a fuse of largecurrent capacity and correspondinglower voltage, which it is to beunderstood is equally true in regard to the other forms of my invention,as shown.

When an unusual length or very large carrying capacity of fuse-strip isrequired, the outer casing or support may be completely filled with theindependent fuse-casings d and their respective fuse-strips, as shown inFig. 10, in which instance the terminals e of the independentfuse-casings are necessarily dispensed with, and the ends of thefuse-strips are connected either in series or multiple to the terminalsof the outer casing, as herein before described.

The independent compartments may or may not be filled with an insulatingand heat-absorbing material n-such, for instance, as chalk, asbestos,plaster-of-paris, magnesia, silicic acid, sand, &c. It is also to beunderstood that I do not limit myself to the precise construction shownin the drawings, as the same may be varied within reasonable limitswithout departing from the spirit of my in- Vention.

I claim as my invention- 1. An electric safety-fuse comprising a casing,terminals secured to said casing, a plurality of independentlongitudinally-disposed compartments within the casing, fuse-strips inthe several compartments so connected as to form a substantiallyintegral strip from 3. An electric safety-fuse,'comprisinga casing,terminals secured to said casing, a plurality ofindependentlongitudinally-disposed compartments within said casing withtheir respective ends short of the entire length ol the casing, andfuse-strips in the several compartments with the respective endsconnected so as to substantially form a continuous fuse-strip ruimingthrough the plurality of independent compartments, and electricalconnections between the respective terminals and the fuse-strips.

4. An electric safety-fuse, comprisingacasing, terminals secured to saidcasing, partitions arranged radially within said casing from the commoncenter and running longitudinally of the casing and dividing the same upinto a plurality of independent compartments, a fuse-strip in eachcompartment the ends being connected so as to substantially form acontinuous fuse-strip running back and forth through the plurality ofindependent compartments, and electrical connections between therespective terminals and the fuse-stri ps.

5. An electric safety-f use, comprising a casing, terminals secured tosaid casing, partitions arranged radially w'ithin said casing from acommon center and running longitudinally of the casing and dividing thesame up into a plurality of independent compartments, a continuousfuse-strip extending progressively back and forth through the severalcompartments and bent around the ends of the partitions separating therespective compartments, and electrical connections between therespective terminals and the fusestrips.

6. An electrical safety-fuse, comprising a casing and terminals securedto said casing, a plurality of partitions creating cellular compartmentswithin the casing, a fuse-strip in each compartment their ends soconnected as to form asubstantially integral strip from end to end ofthe compartments, and electrical connections between the respectiveterminals and the fuse-strips.

7. An electrical safety-fuse, comprising a casing and terminals securedto said casing, a plurality of partitions creating cellular compartmentswithin the casing, and a fuse-strip connected at one end to one terminaland eX- IOO IIO

a substantially integral strip from end to end of the compartments, andelectrical connections between the respective terminals and thefuse-strips.

Signed by me this 23d day of September, 1902.

JOSEPH QSACHS. Vitnesses:

J As. C. HOWELL, CHAS. H. SAGE.

